[Barry, trust me I've been emailing the proud owner of one of those tanks for the past few hours hammering out a number of thoughts on this setup.
Because of its small size, it would be an AMAZING coffeetable setup, if it wasn't for the need for a light right above the darn thing.
I'm trying to figure out a way to prevent siphoning too much, as the return outlet (looks like a plus sign) is submerged about halfway, to provide flow and yet not disturb the surface for viewing. If the return pump failed for some reason, half the tank would drain. A check valve might work, but there has to be a way to keep the water in the top. Almost like a valve that closes when power is off, like they use for CO2 tanks. A UPS would work as well, for short periods of time.]